Spark-plug.



FICE..

EARL CANEDY, F CIQCLG HEIGHTS, XLLNGIS.

Specification of Letters Patent. itpatented Jan. 24, '1911.

Application i'lcd March iti, i965. .lcrial No, 259,445. n

in -vsparking plugs" t'or explosive engines and is embodied in theconstruction and are rangement of parts presently to be described anddefined in the claims.

My invention is designed to avoid the necessity of the use of a Wrenchor hand tool and to render the sparking plug susceptible of beingquickly removed, or atletst the insulator, without the employment oithand tools or wrenches.-

A :turther object of the invention .is to t providea sparking plug withan insulator holder, the latter having an attached handle extensionthereon, and to so form the connection between tl e insulator holder andthe nipple that the same can be easily removed without a lull rotationof the parts.

A still further'object is the provision o a. sparking plug` with what. lhave 1f 1"led a quick release i for the insrdator 'associate with theholder for the insulator an outwardly extending handle. In connectionwiththe quick release, it is designed to be applied from two or moredilli'erent positions so that should the nipple be threaded into thecylinder and be positioned so as to have some of the fixed parts ot theengine interfere with the handle of the holder, then the holder could beturned to another position` and the coupling properly made. l

In my construction a further advantage may be stated to reside in an,insulator holder with a handle so 'that when the insulator is removedthe handle can bey employed conveniently for holding purposes during thecleaning operationn Again by employing ay handle as a part of the insulator holder and thus avoiding the use of wrenches, the liability olibreaking the proy truding end of the insulator avoided which is not thecase when a detached wrench is employed.

lith the above stated. objects of the invention, I desire it understoodthat the construction shown in the accompanying draw- "oint is formed ltis to be und ings is one embodiment but that variations cau be madeWithout departing from the nature of the iwf-enden.

Figure l, is a loingitudinal section of a sparking plug embodying theinvention,

showing a part ot the cylinder; Fig. 2, is a perspective View ot thesparker; Fig. 3 is a, section through the line i3- af ot Fig. l; showingonly the nipple; and Fig. il, is a sectional View of the carrier.

A designates the exterior metallic shell the same being a portion of thecylinder part oit an explosive engineY into which is secured by sthreaded cmineotion the sparking nipple l 'torn'iing one ot theelectrodes. This sparkiiig nipple having a central bore is irovidedeteriorl): with a Wrench hold and the upper part of the interiorchambercd out or enlarged to form a receiving portion 'tor the insulatorcarrier or hohl tel), presently to be described. The nipple l is soconstructed that it can be readily produced by iinachine Work, thelou'cr wall of the upper clnnnberedpart being provided With a seat suchas L. The inner side Walls of the chambered part ot the nipple areprovided With suitable interrupted threads ar ranged at ditiierentpoints to torni one por tion or oit a breech block coupling s Y f fhounin 2l.

C de gnates what l' shall terni a holder or carrying sleeve haring acentral boro, the upper portion ot `which is threaded and io thethreaded portion adapted to be fitted the hollow bushing l). Below thethreaded portion oit the holder C is a chamber, the louer end oit 'whichterminates in an inwardly extended tlange c, against which a packingagasket rests. the holder C has the extended couplin part C formed withsuiu able interrupted threads at ditlerent points and corresponding inlength to the length of the space between the threads in the chamber ofthe nipple B, The purpose of this construction is to acquire a breechblock type ot joint, whereby the holder can be inserted quickly' in thenipple and by a lturn than a complete turn, be securely positioned inthe nippleL ln this connection the construction is such that the lowerV`endv ot, the holder can loe readily machinetinished so that, when theparts come 'together a practical and ehcient,

conn kci n tl' e n, in tl l ing can se .f

out from the upper portion of the holder is a lever E in the formof ahand hold, the same being lixedly secured to the holder. This lever maybe provided with a suitable opening, if desired, at its outer end. It isto be understood that the particular form of lever shown is a preferredembodiment, but that various other forms or engaging projections or:hand holds can be employed.

.F designates the insulator, which at one end projects into the nippleand at the opposite end projects beyond the holder and 'is exposed, asis customary, and, as is usual,

this insulator is conveniently made with a longitudinal perforationthrough which the electrode G passes. This insulator is provided at apoint adjacent its center with an annular `shouldered part f fitting inthe lower part of the holder C and between the horizontal parts of theshoulder both above and below are placed conveniently suitable sealingagents or washers, and by the packing -nut this insulator is iXedlysecured in the holder C. The insulator may very conveniently be cementedinto the holder as in practice it will seldom be necessary to remove theinsulator from the holder. The elect-rode G is conveniently secured inthe insulator in any suitable manner, one method being illustrated inthe drawings, which method is by threading onto the lower end ot theconductor a suitable nut f2 and at the upper end securing a cap g havinga depending annular flange fitting the upper end o the insulator.Interposed between the cap g and the insulator is a compensating disk gso that when the cap is screwed down on the conductor the compensatingdisk will permit slight expansions ofthe materials without causingrupture. On the upper end of the electrode is a thumb nut g2 betweenwhich an'd the cap the main conductor wire is attached. The lower end orsparking end of the electrode G is conveniently bent at a' right angleto a point adjacent the inner wall of the bore of the nipple B, andinasmuch as the metallic parts are machine-finished the electrode'together with the insulator can be readily removed and when replaced theposition of the sparking point relative to the nipple wall will alwaysbe the same. This is an 4important advantage.

In operation should the lower part of the insulator in the nipple becomecoated with carbon, it is only necessary to give the holder a quarterturn so that the threads thereof will register with the smooth partsbetween the threads of the nipple, and it may then be quickly drawn outthereby exposing the lower part of the insulator which can obviouslythereafter be easilyzcleaned, and again quickly replaced. Theconstruction also avoids the necessity of the use of the vexceedinglydiflicult to employ a wrench;

and the avoidance of the removal of the nipple.

Having thus described the invention what .is claimed as new and desiredto be secured by Letters Patent is l. A spark plug for explo, iveengines comprising a nipple part threa ed for fixed connection with thecylinder of an engine,

larged chamber formed with a parallel series of interrupted threads, theseriesbeing spaced apart at opposite ends leaving intevening spaces, acarrier having an internal bore,.a handle, and a seriesoia interruptedthreads adapted for cooperation with the threads of the nipple part, aninsulator in the carrier and projecting in opposite directions beyondthe same, and a nut bushing at the outer end of thc-.carrier having athreaded engagement therewith, substantially as described.

2. A spark plug for explosive en 'nes comprising a nipple part threadedfor xed engagement with an engine cylinder, the outer part of the nipplehaving an enlarged chamber formed with a series of interru ted threadsspaced apart at opposite en n carrier having a cent-ral bore, and aninwardly extending shoulder part at its inner end and a threaded outerart, inter rupted threads on the'outer ace of the lower part of thecarrier adapted for cooperation with the threads of the nipple, anut'bushing threaded to the upper art of the carrier, a handle extensionon t e car-- rier, and an electrode having a shouldered part resting onthe shoulders of the carrier and with which the nut bushing coperates.In testimony whereof I alix my signature in presence of two witnesses.

EARL CANEDY. Witnesses:

Trios. R. HEATH, CALVIN T. MILANS.

the outer part of the nipple having an eno los

